You will notice you can purchase cover plates for your switch box that are normal sized, but they also sell oversized plates. I'm not suggesting you bash at the wall with a hammer, but the plate will cover a lot of collateral damage when installing a box. To install a remodel box, cut the nail posts off the outside of the box so you can slide it into the wall, then screw through the inside of the box into the adjacent stud. (This is far easier with a screw gun.)
Make sure you pull the wire through the holes in the box before you stick it in the wall.... Grins.